What are the causes of driveshaft noise?
2 Answers
Reasons for driveshaft noise: 1. Excessive clearance caused by wear of the spline teeth and sleeve connecting the transmission output shaft and driveshaft; 2. Loose driveshaft universal joint bearings, which produce noise during starting, acceleration, and braking, and may even detach in severe cases; 3. Imbalance due to detached or unqualified balancing weights on the driveshaft, resulting in dull noise during high-speed operation. Daily maintenance methods for driveshaft: 1. Check if the spline teeth on the output shaft have become pointed, and replace the output shaft if necessary; 2. Replace the driveshaft spline sleeve and driveshaft bearings; 3. Replace the driveshaft universal joint bearings or the entire driveshaft assembly.
After driving and repairing cars for so many years, I've encountered many causes of driveshaft noise. The most common is worn universal joints—the part that bends and transfers force on the driveshaft. When the rubber deteriorates or the grease dries up, increased friction causes squeaking. A failed center support bearing is also serious—it holds up the middle of the driveshaft, and when loose, it makes thumping noises on bumpy roads. An unbalanced driveshaft causes wobbling sounds, either from factory misalignment or impact deformation. Loose bolts at connection points will create clunking noises if not tightened properly. All these require prompt inspection, otherwise the noise worsens—a broken universal joint could even lead to loss of control. During normal driving, try revving in neutral to listen for rhythmic noises—if heard, it's time for repairs.
